cleanup: include/: move crc.h to sys/crc.h

move crc.h to sys/crc.h and
create a shim for backward-compatibility.

No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.

Related to #16539

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

include/sys/crc.h

@@ -0,0 +1,182 @@
+/*
+ * Copyright (c) 2018 Workaround GmbH.
+ * Copyright (c) 2017 Intel Corporation.
+ * Copyright (c) 2017 Nordic Semiconductor ASA
+ * Copyright (c) 2015 Runtime Inc
+ * Copyright (c) 2018 Google LLC.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+/** @file
+ * @brief CRC computation function
+ */
+
+#ifndef ZEPHYR_INCLUDE_SYS_CRC_H_
+#define ZEPHYR_INCLUDE_SYS_CRC_H_
+
+#include <zephyr/types.h>
+#include <stdbool.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Initial value expected to be used at the beginning of the crc8_ccitt
+ * computation.
+ */
+#define CRC8_CCITT_INITIAL_VALUE 0xFF
+
+/**
+ * @defgroup checksum Checksum
+ */
+
+/**
+ * @defgroup crc CRC
+ * @ingroup checksum
+ * @{
+ */
+
+/**
+ * @brief Generic function for computing CRC 16
+ *
+ * Compute CRC 16 by passing in the address of the input, the input length
+ * and polynomial used in addition to the initial value.
+ *
+ * @param src Input bytes for the computation
+ * @param len Length of the input in bytes
+ * @param polynomial The polynomial to use omitting the leading x^16
+ *        coefficient
+ * @param initial_value Initial value for the CRC computation
+ * @param pad Adds padding with zeros at the end of input bytes
+ *
+ * @return The computed CRC16 value
+ */
+u16_t crc16(const u8_t *src, size_t len, u16_t polynomial,
+	    u16_t initial_value, bool pad);
+
+/**
+ * @brief Compute the CRC-16/CCITT checksum of a buffer.
+ *
+ * See ITU-T Recommendation V.41 (November 1988).  Uses 0x1021 as the
+ * polynomial, reflects the input, and reflects the output.
+ *
+ * To calculate the CRC across non-contiguous blocks use the return
+ * value from block N-1 as the seed for block N.
+ *
+ * For CRC-16/CCITT, use 0 as the initial seed.  Other checksums in
+ * the same family can be calculated by changing the seed and/or
+ * XORing the final value.  Examples include:
+ *
+ * - X-25 (used in PPP): seed=0xffff, xor=0xffff, residual=0xf0b8
+ *
+ * @note API changed in Zephyr 1.11.
+ *
+ * @param seed Value to seed the CRC with
+ * @param src Input bytes for the computation
+ * @param len Length of the input in bytes
+ *
+ * @return The computed CRC16 value
+ */
+u16_t crc16_ccitt(u16_t seed, const u8_t *src, size_t len);
+
+/**
+ * @brief Compute the CRC-16/XMODEM checksum of a buffer.
+ *
+ * The MSB first version of ITU-T Recommendation V.41 (November 1988).
+ * Uses 0x1021 as the polynomial with no reflection.
+ *
+ * To calculate the CRC across non-contiguous blocks use the return
+ * value from block N-1 as the seed for block N.
+ *
+ * For CRC-16/XMODEM, use 0 as the initial seed.  Other checksums in
+ * the same family can be calculated by changing the seed and/or
+ * XORing the final value.  Examples include:
+ *
+ * - CCIITT-FALSE: seed=0xffff
+ * - GSM: seed=0, xorout=0xffff, residue=0x1d0f
+ *
+ * @param seed Value to seed the CRC with
+ * @param src Input bytes for the computation
+ * @param len Length of the input in bytes
+ *
+ * @return The computed CRC16 value
+ */
+u16_t crc16_itu_t(u16_t seed, const u8_t *src, size_t len);
+
+/**
+ * @brief Compute ANSI variant of CRC 16
+ *
+ * ANSI variant of CRC 16 is using 0x8005 as its polynomial with the initial
+ * value set to 0xffff.
+ *
+ * @param src Input bytes for the computation
+ * @param len Length of the input in bytes
+ *
+ * @return The computed CRC16 value
+ */
+static inline u16_t crc16_ansi(const u8_t *src, size_t len)
+{
+	return crc16(src, len, 0x8005, 0xffff, true);
+}
+
+/**
+ * @brief Generate IEEE conform CRC32 checksum.
+ *
+ * @param  *data        Pointer to data on which the CRC should be calculated.
+ * @param  len          Data length.
+ *
+ * @return CRC32 value.
+ *
+ */
+u32_t crc32_ieee(const u8_t *data, size_t len);
+
+/**
+ * @brief Update an IEEE conforming CRC32 checksum.
+ *
+ * @param crc   CRC32 checksum that needs to be updated.
+ * @param *data Pointer to data on which the CRC should be calculated.
+ * @param len   Data length.
+ *
+ * @return CRC32 value.
+ *
+ */
+u32_t crc32_ieee_update(u32_t crc, const u8_t *data, size_t len);
+
+/**
+ * @brief Compute CCITT variant of CRC 8
+ *
+ * Normal CCITT variant of CRC 8 is using 0x07.
+ *
+ * @param initial_value Initial value for the CRC computation
+ * @param buf Input bytes for the computation
+ * @param len Length of the input in bytes
+ *
+ * @return The computed CRC8 value
+ */
+u8_t crc8_ccitt(u8_t initial_value, const void *buf, size_t len);
+
+/**
+ * @brief Compute the CRC-7 checksum of a buffer.
+ *
+ * See JESD84-A441.  Used by the MMC protocol.  Uses 0x09 as the
+ * polynomial with no reflection.  The CRC is left
+ * justified, so bit 7 of the result is bit 6 of the CRC.
+ *
+ * @param seed Value to seed the CRC with
+ * @param src Input bytes for the computation
+ * @param len Length of the input in bytes
+ *
+ * @return The computed CRC7 value
+ */
+u8_t crc7_be(u8_t seed, const u8_t *src, size_t len);
+
+/**
+ * @}
+ */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif